Hubble's Bubble

From Author Wars - https://authorwars.com/publications/hubbles-bubble-587001.html

Overview:

Title: Hubble's Bubble
Author: Elaine Horseman
Year: 1964
Publisher: W. W. Norton & Company
Price: $3.50
Pages: 220
Binding: Hardcover
Type: Novel
Title Reference: Hubble's Bubble
Notes: 1st US ed. evidently Price from review Digby B. Whitman Chi. Tribune 1964-11-01 p16A: with Charlie and the Chocolate Factory, "These two fine fantasies offer a striking contrast in creative rule breaking." (very positive)

Cover image from Amazon US 2016-10-02, uncertainly, -- states "Hardcover – Import, 1964" and "W.W. Norton & Co.; First Edition edition (1964)" but Norton is the US publisher